Highly dispersed CeO_(2-x)nanoparticles with rich oxygen vacancies enhance photocatalytic performance of g-C_(3)N_(4)toward methyl orange degradation under visible light irradiation  

作　　者：Xuejun Xu Tianhua Huang Yisheng Xu Huawen Hu Shuang Liao Xiaohong Hu Dongchu Chen Min Zhang 

机构地区：[1]School of Materials Science and Hydrogen Energy,Foshan University,Foshan 528000,China [2]Guangdong Key Laboratory for Hydrogen Energy Technologies,Foshan 528000,China

出　　处：《Journal of Rare Earths》2022年第8期1255-1263,共9页稀土学报（英文版）

基　　金：Project supported by the Guangdong Provincial Education Department Special Project of Key Research Areas(2020ZDZX2066);the Innovation Team of Universities of Guangdong Province(2020KCXTD011);the Engineering Research Center of Universities of Guangdong Province(2019GCZX002);the Guangdong Key Laboratory for Hydrogen Energy Technologies(2018B030322005);Guangdong Basic and Applied Basic Research Foundation(2019A1515110586,2019A1515110534)。

摘　　要：CeO_(2)/g-C_(3)N_(4)photocatalysts have attracted tremendous attention in the photocatalytic degradation of organic pollutants.The design and construction of highly active CeO_(2)/g-C_(3)N_(4)photocatalysts without harsh conditions are still challenging.Herein,highly dispersed CeO_(2-x)nanoparticles with rich oxygen vacancies were successfully precipitated on the surface of g-C_(3)N_(4)under mild conditions.The fabricated CeO_(2-x)/g-C_(3)N_(4)exhibits remarkable activity and stability for photocatalytic degradation of MO pollutant.The optimal rate constant of MO degradation over CeO_(2-x)/g-C_(3)N_(4)is about 0.031 min^(-1),which is three times higher than that of g-C_(3)N_(4).A negligible activity decrease is observed after three cycling runs.The enhanced catalytic performance can be ascribed to the excellent dispersion of CeO_(2-x)with rich oxygen vacancies that benefit O_(2)adsorption and visible light absorption.In addition,the proper band alignment between CeO_(2-x)and gC_(3)N_(4)is conducive to the highly efficient separation of photogenerated electron-hole pairs.

关 键 词：CeO_(2-x) G-C_(3)N_(4) HETEROJUNCTIONS Oxygen vacancies Rare earths 

分 类 号：O643.36[理学—物理化学] O644.1[理学—化学] X703[环境科学与工程—环境工程]